StrictMode in React is a valuable tool designed for developers to detect possible problems within a web application. For its child components, it enables better deprecation checks and warnings. Its popularity stems from the ability to provide visual feedback in the form of warning and error messages whenever developers deviate from recommended React rules and best practices. Similar to the React Fragment, the React StrictMode Component doesn't have any visible user interface components.
React StrictMode reveals potential flaws within your application, enabling the development of more comprehensible and secure programs. You don't have to import this feature independently since it is already integrated into the React package. Simply enclose any questionable code with the StrictMode helper component, and you're good to go. Now, let's explore how to leverage it with functional React components. For enabling the StrictMode for a react component we can follow the below syntax:
<React.StrictMode>
<SuspiciousComponent/>
</React.StrictMode>
In development mode, StrictMode does not render any visible elements in the DOM. However, it performs checks and provides warnings. StrictMode offers the following supported functionalities:
Detection of unexpected side effects within React components.
Identifying deprecated and potentially hazardous lifecycle methods in React.
Detection of legacy Context API usage.
Recognition of the deprecated findDOMNode function.
If you're working with a codebase that you didn't write, in these cases, react's StrictMode can prove invaluable in ensuring the correctness of the code structure, particularly if the React application was developed by an inexperienced programmer.
Identifying bugs in JavaScript code can be challenging. However, by wrapping the code in StrictMode, you can gain insights into any issues that may be present. StrictMode, in general, is among the most beneficial features of React. It aids new developers in cultivating the habit of producing code that adheres to React's best practices. The more you experiment with StrictMode, the more comfortable and proficient you will become in utilizing its capabilities.
Note: StrictMode is specifically designed for use in Development Mode and serves to provide warnings concerning legacy refs. To facilitate the identification of unexpected side effects within these methods, StrictMode deliberately triggers a double invocation of rendering phase lifecycles and functions. This intentional duplication of invocations helps to highlight any potential issues and encourages developers to address them accordingly.